package com.lagou.web.servlet;

import com.lagou.base.Constants;
import com.lagou.pojo.Course;
import com.lagou.service.CourseService;
import com.lagou.service.impl.CourseServiceImpl;
import com.lagou.utils.DateUtils;
import com.lagou.utils.UUIDUtils;
import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.IOUtils;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @description: 新建和更新课程信息
 * @author: zhuxiang
 * @create: 2020-07-27 22:01
 **/
@WebServlet("/courseSalesInfo")
public class CourseSalesInfoServlet extends HttpServlet {
    /**
     * 保存课程营销信息
     *   收集表单数据，封装到course对象中，将图片上传到tomcat服务器中
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        try {
            //1.创建Course对象
            Course course = new Course();

            //2.创建Map集合，用来收集数据
            Map<String,Object> map = new HashMap<>();

            //3.创建磁盘工厂对象
            DiskFileItemFactory factory = new DiskFileItemFactory();

            //4.文件上传核心对象
            ServletFileUpload fileUpload = new ServletFileUpload(factory);

            //5.解析request对象，获取表单项集合
            List<FileItem> list = fileUpload.parseRequest(req);

            //6.遍历集合 判断哪些是普通的表单项，哪些是文件表单项
            for (FileItem item : list){
                boolean formField = item.isFormField();
                if (formField){
                    //普通表单项
                    String fieldName = item.getFieldName();
                    String filedValue = item.getString("utf-8");
                    //System.out.println(fieldName+" "+filedValue);
                    //使用map收集数据
                    map.put(fieldName,filedValue);
                }else {
                    //文件上传项
                    //获取文件名
                    String fileName = item.getName();
                    String newFileName = UUIDUtils.getUUID()+"_"+fileName;
                    //获取输入流
                    InputStream in = item.getInputStream();
                    //创建输出流
                    //1.获取项目的运行目录
                    String realPath = this.getServletContext().getRealPath("/");
                    //2.截取到webapps目录路径
                    String webappsPath = realPath.substring(0, realPath.indexOf("lagou_edu_home"));
                    //3.拼接输出路径，将图片保存到upload
                    FileOutputStream out = new FileOutputStream(webappsPath+"/upload/"+newFileName);

                    //使用IOUtils完成 文件的copy
                    IOUtils.copy(in,out);

                    //关闭流
                    out.close();
                    in.close();

                    //将图片路径进行保存
                    map.put("course_img_url", Constants.LOCAL_URL+"/upload/"+newFileName);
                }
            }
            //使用BeanUtils 将map中的数据封装到Course对象
            BeanUtils.populate(course,map);
            String format = DateUtils.getDateFormart();
            CourseService cs = new CourseServiceImpl();
            if (map.get("id") != null){
                //修改操作
                //补全信息
                course.setUpdate_time(format);
                //业务处理 修改
                String result = cs.updateCourseSalesInfo(course);
                //响应结果
                resp.getWriter().print(result);
            }else {
                //补全信息
                course.setCreate_time(format);
                course.setUpdate_time(format);
                course.setStatus(1);

                //业务处理 保存
                String result = cs.saveCourseSalesInfo(course);
                //响应结果
                resp.getWriter().print(result);
            }

        } catch (FileUploadException | IllegalAccessException | InvocationTargetException e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}
